All of these scenarios are examples of evolution, with the exception of the? a) loss of hind limbs by whales b) gradual loss of toes on the feet of horses c) change of a caterpillar into an adult butterfly d) change of bones in ostriches, from hollow to solid?

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.